@Override
	public boolean equals(Object obj){
		if (obj == null)
	        return false;
	    if (obj == this)
	        return true;
	    if (obj.getClass() != getClass())
	        return false;
	    
	    Coord a = (Coord)obj;
	    
	    if(a.x == this.x && a.y == this.y){
	    	return true;
	    }
	    else{
	    	return false;
	    }
	}
	
	@Override
	public int hashCode() {
		int hash = 1;
		   
       		hash += hash * 17 + this.x;
        	hash += hash * 31 + this.y;
 
        	return hash;
	}